JP3436393B2 - Optical disk reproduction method and optical disk - Google Patents

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Techniques Means for Solving Problems (FIGS. 1, 3, 4, and 6) Actions (FIGS. 1, 3, 4, and 6) Implementation Example (1) First Example (FIGS. 1 to 3) (2) Second Example (FIGS. 1 and 4 to 6) (3) Other Examples Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing method and an optical disc, and can be applied to, for example, an optical disc device used as an auxiliary storage device of a computer.

[0003]

2. Description of the Related Art Conventionally, there is an optical disk device of this type which can be used as an auxiliary storage device such as a computer.

In other words, an optical disk applied to this type of optical disk device can be mass-produced by applying a manufacturing method similar to that of the compact disk, whereby a large amount of large-capacity data can be supplied. Therefore, if this type of optical disk device is used as an auxiliary storage device for a computer, text data such as a dictionary with a large amount of data can be supplied simply and in large quantities, and this allows connection to the computer and usability of the computer. Is designed to be able to improve.

[0005]

By the way, when various data are supplied using this type of recording medium, there is a risk that the data may be illegally copied. In this case, there can be considered a method of prohibiting this kind of illegal copy by performing copy protection like data supplied via a floppy disk, etc., but this method has a feature that copying cannot be completely prohibited. is there.

The present invention has been made in consideration of the above points, and an object thereof is to propose an optical disk reproducing method and an optical disk capable of effectively avoiding illegal copying.

[0007]

In order to solve such a problem, in the present invention, the optical disk 2 is irradiated with a light beam in response to a predetermined control command, and the reflected light of the light beam is received to receive the optical disk 2. In the optical disk reproducing method for reproducing the user data recorded in the above, the recording area is divided into a plurality of sectors, and the user data provided in the head sector TS designated by a predetermined command given from the host computer among the sectors. Recording area D0 to D51
The user data recording areas D0 to D provided with the directory data, the file allocation table, and the loader in 1 and provided in other sectors than the first sector TS.
User data is recorded in a predetermined data unit in 511 and an externally inaccessible area V provided in the sector
For the optical disc 2 in which the vendor unique data is recorded in U1 to VU4, the loader is reproduced from the head sector TS designated by a predetermined command given by the host computer and sent to the host computer, and the loader given from the host computer. When the vendor unique data is reproduced from a sector other than the first sector TS of the optical disk 2 in response to a command issued by the optical disk 2 and the vendor unique data having a predetermined value X set in advance is reproduced from the other sector, the predetermined value Another sector corresponding to the vendor unique data of X is set as a new head sector, and user data is reproduced from the new head sector of the optical disk 2 according to a predetermined control command given from the host computer to reproduce the host computer. Output from other sectors When not reproducing the vendor unique data value X is not to reproduce the user data.

Further, in the present invention, the recording area of the optical disk 2 is divided into a plurality of sectors, and the head of the user data recording areas D0 to D511 provided in each sector is designated by a predetermined command of the host computer. The directory data, the file allocation table, and the loader are recorded in the user data recording areas D0 to D511 of the sector TS, and the user data is recorded in a predetermined data unit in the user data recording areas D0 to D511 other than the first sector TS. , And the external inaccessible area VU1 provided in another sector reproduced in response to a command issued by the loader reproduced from the first sector TS.
~ Predetermined value X designating another sector to be set as a new start sector for reproducing user data in external inaccessible areas VU1 to VU4 provided in a specific other sector among VU4 instead of the start sector TS Recorded the vendor unique data of.

[0009]

[0010]

[0011]

Therefore, without adding any special function to the host computer, the reproduction control similar to the normal optical disk reproduction control irrelevant to the setting of the new head sector is executed, and the vendor unique value of the predetermined value X is executed. Only when the data can be reproduced, the optical disc 2 can be judged as the regular optical disc 2, and the optical disc 2 can be designated by the vendor unique data having a predetermined value X different from the leading sector TS of the regular optical disc 2. It is possible to set the specific sector of as the new head sector and reproduce the user data from the new head sector.

[0012]

[0013]

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment In FIG. 1, reference numeral 1 denotes an optical disk device as a whole,
The desired data is recorded / reproduced by using the recordable / reproducible optical disk 2, and further the desired data is reproduced from the reproduction-only optical disk 2.

That is, the optical disk device 1 is produced by applying the magneto-optical recording method to record / reproduce desired data and the same method as the compact disk. A read-only ROM (read-only memory) disk is also applicable. The optical disk device 1 drives the spindle motor S by the spindle motor control circuit 3 to rotationally drive the optical disk 2 at a predetermined rotation speed.

In this state, the laser control circuit 4 drives a laser diode built in the optical pickup 5 to irradiate the optical disk 5 with a light beam. The optical pickup 5 receives the reflected light of this light beam by a predetermined light receiving element and outputs the light receiving result to the RF signal processing circuit 6.

The RF signal processing circuit 6 performs current-voltage conversion processing on the received light result, and then performs addition / subtraction processing by a predetermined matrix circuit to obtain the tracking error signal TE,
The focus error signal FE is generated, and the tracking error signal TE and the focus error signal FE are output to the servo control circuit 7. As a result, the optical disk device 1
With the servo control circuit 7, the tracking error signal TE,
By moving the optical pickup 5 and the objective lens built in the optical pickup 5 on the basis of the focus error signal FE, tracking control and focus control can be performed.

In addition to this, the servo control circuit 7 is adapted to move the optical pickup 5 in the radial direction of the optical disc in response to a control command output from the system control circuit 9, whereby the optical disc apparatus 1 is moved. , The optical disk 5 is sought to access the optical disk 2. Further, the RF signal processing circuit 6 performs the addition / subtraction processing on the light reception result, and the signal level changes according to the change of the reproduction signal (which is a so-called sum signal) whose signal level changes according to the amount of reflected light and the polarization plane of the reflected light. And a reproduction signal (which is a so-called difference signal) that changes.

As a result, when reproducing the optical disk 2 which is a ROM disk, the optical disk device 1 reproduces desired data by binarizing this sum signal and then processing it in the subsequent data modulation / decoding circuit 8. To be able to
Further, the address data of the reproduction position (that is, a physical address) can be detected. On the other hand, when the optical disc device 1 reproduces the optical disc 2 which is a magneto-optical disc, after binarizing this difference signal,
The subsequent data modulation / decoding circuit 8 processes it so that desired data can be reproduced, and the sum signal is further taken in at a predetermined cycle and processed so that the address data at the recording / reproducing position can be detected. ing.

Thus, the system control circuit 9 can seek the optical pickup 5 by issuing a control code to the servo control circuit 7 on the basis of the address data thus detected.

The data modulation / decoding circuit 8 obtains reproduced data by binarizing the reproduced signal output from the RF signal processing circuit 6 and then 7-2 demodulating the reproduced signal. The reproduced data is buffered. Output to the control circuit 10. At this time, the error detection / correction circuit (ECC) 11 performs error correction processing on the reproduction data by using the error detection / correction code reproduced together with the reproduction data, whereby the optical disk device 1 surely obtains desired data. It is designed to be playable.

At the time of this error correction processing, the error detection / correction circuit 11 outputs the error correction result to the system control circuit 9,
As a result, the system control circuit 9 determines whether or not the desired data has been correctly reproduced, issues a control code as necessary, and repeats the reproduction operation. Further, when an error occurs in the reproduced data, the system control circuit 9 causes the SCSI (smal
l computer system interface) The host computer is interrupted via the interface circuit (I / F) 12, and an error code indicating that an error has occurred is issued to the host computer.

The buffer control circuit 10 sequentially inputs the reproduced data reproduced in this manner and stores it in the buffer memory 13, and the reproduced data stored in the buffer memory 13 is sent from the SCSI interface circuit 12 to the host at a predetermined timing. Output to the computer. The system control circuit 9 is the SCSI interface circuit 1
By controlling the entire operation in response to a control command issued from the host computer via 2, the optical disk device 1 is configured to execute the series of reproduction processes. It is adapted to output a large amount of data to the host computer.

On the other hand, when a write control command is issued from the host computer with the optical disk 2 made of a magneto-optical disk loaded, the system control circuit 9 switches the entire operation mode to the recording mode. .
In response to this, the buffer control circuit 10
Input data input via the SI interface circuit 12 is stored in the buffer memory 13 and output to the data modulation / decoding circuit 8 at a predetermined timing.

At this time, the error detection / correction circuit 11 generates an error detection / correction code of this input data and outputs it to the data modulation / decoding circuit 8, and the data modulation / decoding circuit 8 receives this input data and the error detection / correction code. 2-7 is modulated and converted into recording data. The RF signal processing circuit 6 forms a reference clock for recording on the basis of the reproduction result composed of the sum signal, and outputs this reference clock to the laser control circuit 4.

The laser control circuit 4 drives the optical pickup 5 in synchronism with this reference clock to switch the light amount of the light beam to the light amount at the time of recording and intermittently irradiate the light beam. As a result, the optical disk device 1 applies a modulation magnetic field to the irradiation position of this light beam,
By switching the polarity of this modulating magnetic field according to the recording data, the method of thermomagnetic recording can be applied to record desired data.

(1-1) System Control Circuit When the system control circuit 9 reproduces the optical disc 2 in this way, it reproduces the user data of each sector by referring to the vendor unique data recorded in the optical disc 2. By doing so, it is possible to effectively avoid an illegal copy of the user data assigned to each sector.

That is, in this type of optical disc 2, the recording area is divided into sector units, and data is recorded in each sector according to the format shown in FIG. Here, this format is an ISO (internatinal stand) for an optical disc 2 having a diameter of 3.5 inches.
ards organization), one sector is formed by 525 bytes of data.

In each sector, a 512-byte area of D0 to D511 is assigned to user data, and the following VU1 to VU are assigned.
The 4-byte area of U4 is allocated to the vendor unique data, and in the optical disc device 1, the vendor unique data can be freely set when the optical disc 2 is created. Further, in each sector, 4 bytes of CRC1 to CRC4 are subsequently assigned to the parity code, and the remaining 5 × 16 bytes of E1, 1 to E5, 16 are assigned to the error detection and correction code.

Accordingly, in the optical disc device 1,
When a read command is issued via the SCSI interface circuit 12, the optical disk 2 is reproduced in sector units, and 512 bytes of data allocated to user data out of 525 bytes of one sector is subjected to error detection and correction processing. It is designed to output.

At this time, the system control circuit 9 refers to the vendor unique data by executing the processing procedure shown in FIG. 3, thereby effectively avoiding an illegal copy. That is, the system control circuit 9 shifts from step SP1 to step SP2, and determines here whether or not a control command is input from the host computer.

If a negative result is obtained here, the system control circuit 9 repeats step SP2, whereas if a positive result is obtained, the system control circuit 9 moves to step SP3 and the vendor I
It is determined whether the command is a control command for ID comparison for D.

That is, in this embodiment, a unique code is assigned to the application program for searching and processing the data stored in the optical disk 2, and the optical disk 2 sets this unique code in the vendor ID and This vendor I as the vendor unique data in the sector
It is designed to record D. In response to this, an application program for searching the data stored in the optical disk 2 issues a predetermined control command (for example, a control command such as mode select) to switch the setting of the optical disk device 1. When this vendor I
An ID for comparison corresponding to D is set.

Accordingly, the system control circuit 9 compares the control command issued from the host computer with I for comparison.
It is determined whether or not a control code for setting D is added, and if a negative result is obtained here, the process proceeds to step SP4 to determine whether or not the control command is a read command. If a negative result is obtained here, the system control circuit 9 proceeds to step SP5 to execute normal processing such as operation mode switching corresponding to the control command, and then executes step SP5.
Return to 2.

On the other hand, when a positive result is obtained in step SP3, the system control circuit 9 causes the step S
Moving to P6, the operation mode is set to the special mode, the control code added to this control command is analyzed, and the ID for comparison is set. Thus, in the optical disc device 1, when the application program corresponding to the optical disc 2 issues a predetermined control code, the comparison ID is set based on this control code.

As a result, the system control circuit 9 sets the operation mode of the entire optical disk device 1 to the special mode, and then returns to step SP2. On the other hand, when a read command is issued from the host computer, a positive result is obtained in step SP4, and the system control circuit 9 moves to step SP7.

Here, the system control circuit 9 judges whether or not the current operation mode is the special mode, and if a negative result is obtained here, the system control circuit 9 moves to step SP5 to reproduce the user data designated by the read command and then step. Return to SP2.
On the other hand, when a read command is input in the special mode, a positive result is obtained in step SP7, so that the system control circuit 9 moves to step SP8 and the sector designated by this read command is read. To play.

Subsequently, the system control circuit 9 proceeds to step S
Moving to P9, the vendor unique data reproduced here is subjected to error correction processing to detect the vendor ID, and a predetermined logical operation processing is executed between this vendor ID and the ID for comparison to obtain this vendor ID. It is determined whether or not the ID for comparison matches. Vendor I played here
When D and the ID for comparison match, step S
If an affirmative result is obtained at P9, the system control circuit 9 moves to step SP10 because the read command for this optical disk 2 is issued by the application program for searching the optical disk 2.
The reproduced user data is output to the host computer.

On the other hand, the reproduced vendor ID and
If the comparison ID does not match, step SP9
If a negative result is obtained in step 1, it can be determined that the read command for the optical disk 2 is issued by an application program other than the application program that searches the optical disk 2. Further, in this type of optical disk device 1, since only user data can be accessed from the outside, the optical disk 2
If the correct vendor ID is not recorded as the vendor unique data, it can be determined that the data stored in the optical disk 2 is copied data.

As a result, when the optical disk device 1 obtains a negative result in step SP9, step SP1
The process moves to 1 and issues a command indicating that an error has occurred during reproduction to move to step SP2, whereby the reproduced user data is not output to the host computer and the process corresponding to the read command is stopped.

Accordingly, in the optical disc device 1,
User data can be output to the legitimate optical disc 2 only when a read command is issued from the corresponding application program, whereby illegal copying can be prohibited, and the illegally copied optical disc 2 can be prevented. Can effectively avoid an illegal copy by stopping the reproduction process. At this time, by issuing a command indicating that an error has occurred during playback and canceling the process corresponding to the read command, the user is not aware that the process of canceling the output of user data has been executed. Processing can be stopped.

(1-2) Effects of the Embodiments According to the above configuration, when the comparison ID set by the application program and the vendor ID recorded in the optical disc 2 as the vendor unique data match, the read operation is performed. By outputting the user data reproduced in response to the command to the host computer, it is possible to output the reproduced user data only when the read command is issued from the corresponding application program to the regular optical disk 2. This makes it possible to effectively avoid illegal copying.

(2) Second Embodiment In this embodiment, the logical sector of the optical disc 2 is reset based on the vendor ID recorded as vendor unique data in the optical disc 2, thereby making illegal copying effective. To avoid.

That is, in this embodiment, as shown in FIG. 4, the optical disk 2 records directory data, file allocation table (FAT), etc. from the head sector, and then sequentially records files of the application loader. To do. Further, the optical disc 2 records directory data, a file allocation table (FAT) following the file of the application loader, and subsequently records a file of the application program.

Thus, as shown in FIG. 5, when the application program is started in the same manner as a normal optical disk, the optical disk 2 is initially operated by the operating system (OS) of the host computer with respect to the drive. By issuing a playback command from 0, the directory data and the file allocation table located in the first sector are accessed by the host computer, and then the subsequent application loader loads them in the host computer.

In the normal optical disk, the processing of the application program is started based on the application loader loaded in the host computer, whereas in this embodiment, the application loader issues the application program. In response to the control command to be executed, the system control circuit 9 executes the processing procedure shown in FIG. 6, whereby the sector in which the directory data and the file allocation table are recorded next to the application loader is reset to the logical sector 0. To do.

That is, the system control circuit 9 shifts from step SP21 to step SP22 and determines here whether or not a control command is input from the host computer. If a negative result is obtained here, the system control circuit 9
While repeating step SP22, when a positive result is obtained, moves to step SP23 and determines whether the control command is a logical sector search command. If a negative result is obtained here, the system control circuit 9 proceeds to step SP24 to execute normal processing such as operation mode switching corresponding to the control command, and then executes step SP2.
Return to.

On the other hand, when the logical sector search command is issued from the host computer, the system control circuit 9 shifts to the next step SP25 and, after setting the target sector (TS) to the logical sector 0,
In step SP26, the sector of the logical sector 0 is reproduced. As a result, the system control circuit 9 causes the logical sector 0 in which the directory data is recorded in this case.
The first sector is reproduced again, and the vendor unique data is taken in from the reproduction processing result.

That is, in this type of optical disk 2, data of value 0 is usually recorded as vendor unique data, and as described above, the contents of this vendor unique data are inaccessible from the outside. . Utilizing the characteristics of this vendor unique data, the optical disk 2 stores the directory data following the application loader, and the vendor of the predetermined value X preset as the vendor unique data of the sector to be reset to the logical sector 0. The ID is recorded, and the vendor I other than the value X is recorded for the remaining sectors.
D is recorded as vendor unique data.

As a result, the system control circuit 9 fetches the vendor ID for the leading sector of the preset logical sector 0, then moves to step SP27, and judges whether the fetched vendor ID is the predetermined value X or not,
In this case, since a negative result is obtained, the step SP
Move to 28. Here, the system control circuit 9 increments the value of the target sector TS by a value of 1, and then moves to step SP29 to determine whether the target sector TS is the final sector. In this case, since a negative result is obtained, the system control circuit 9 continues to the step S.
Returning to P26, the vendor ID is detected for the following sector.

As a result, the system control circuit 9 sequentially steps SP26-SP27-SP28-SP29-SP.
When the vendor ID of the value X is detected by repeating the processing procedure of step 26, a positive result is obtained in step SP27, and thus the process proceeds to step SP30. Here, the system control circuit 9 resets the sector in which the vendor ID of this value X is detected to the sector of the logical sector 0 and sets the step S.
Return to P22.

That is, the system control circuit 9 previously manages the management data (DDS: disk definition strut) of the optical disk 2.
cture) and the detected logical sector is updated to update the logical sector in the same manner as when a new optical disk 2 is loaded, and the optical data recording user data from the reset logical sector 0 is updated. Similar to the case of reproducing the disk, the optical disk 2 is accessed for the control command from the subsequent host computer.

Consequently, when a control command is subsequently issued from the application loader, the system control circuit 9 reproduces and outputs the directory data and the file allocation table based on the reset logical sector 0. The following application program is reproduced and output. At this time, by resetting the logical sector, the operation system on the host computer side can perform the same processing as when executing the application program for the normal optical disk regardless of the resetting of the logical sector. it can.

On the other hand, when the vendor ID of the value X cannot be detected, the system control circuit 9 moves to step SP31 when the final sector is reached and a positive result is obtained in step SP29. Here, the system control circuit 9 issues a command indicating that an error has occurred during reproduction, and returns to step SP22.

As a result, when the optical disc device 1 activates the application program recorded in the optical disc for which the user data has been copied, the vendor unique data cannot be copied. The vendor ID cannot be detected, which makes it difficult to launch this application program correctly. Therefore, in the optical disc device 1, it is possible to effectively avoid the reproduction of the user data that has been illegally copied.

According to the configuration shown in FIG. 6, when the contents of the optical disk 2 are illegally copied by resetting the logical sector based on the vendor unique data, the copied application program is started correctly. Therefore, an illegal copy of user data can be effectively avoided.

(3) Other Embodiments In the first embodiment described above, the logical operation processing is performed to judge whether or not the vendor ID and the comparison ID match, but the present invention is not limited to this. Is not limited to this, by performing various logical operation processing between the vendor ID and the comparison ID and determining whether a predetermined operation processing result is obtained, the vendor ID that is vendor unique data It can be widely applied to the case where the user data is processed on the basis of.

Further, in the above-mentioned second embodiment, the case where the vendor unique data recorded in the sector to be reset to the logical sector 0 is set to the predetermined value has been described, but the present invention is not limited to this, and the logical operation is performed. Vendor unique data of the sector to be processed and reset to a predetermined value may be set to the logical sector 0. Alternatively, the vendor unique data of a predetermined sector may be reset to the logical sector 0. You may make it specify a sector.

[0061]

As described above, according to the present invention, the loader is reproduced from the user data recording area in the head sector of the optical disk designated by the predetermined command given from the host computer and sent to the host computer. ,
In response to a command issued by the loader from the host computer, the vendor unique data is reproduced from the externally inaccessible area in the sector other than the first sector of the optical disk, and the predetermined value set in advance from another sector is reproduced. When the vendor unique data is reproduced, another sector corresponding to the vendor unique data of the predetermined value is set as a new start sector, and a new start sector of the optical disk is set according to a predetermined control command given from the host computer. The user data is reproduced from the user data recording area in the host computer and output to the host computer, and when the vendor unique data of a predetermined value cannot be reproduced from other sectors, the user data is not reproduced, so that the host computer New destination without adding special functions It is possible to judge the optical disk as a regular optical disk only when the reproduction control similar to the normal optical disk reproduction control, which has nothing to do with the sector setting, is executed and the vendor unique data of the predetermined value can be reproduced. At the same time, the user data can be reproduced from another specific sector designated by the vendor unique data of a predetermined value different from the leading sector of the regular optical disk, and thus the user recorded in the other specific sector. It is possible to effectively avoid illegal copying of data.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical disk device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a sector format of the optical disk.

FIG. 3 is a flowchart for explaining the operation.

FIG. 4 is a schematic diagram for explaining an optical disk applied to a second embodiment.

FIG. 5 is a schematic diagram for explaining the operation of the optical disk device.

FIG. 6 is a flowchart for explaining the operation.

[Explanation of symbols]

1 ... Optical disk device, 2 ... Optical disk, 6 ... RF
Signal processing circuit, 8 ... Data modulation / decoding circuit, 9 ... System control circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-4-259958 (JP, A) JP-A-4-356760 (JP, A) JP-A-63-132336 (JP, A) JP-A-5- 12808 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/10 G11B 19/00-19/16 G11B 20/12 G11B 20/18

Claims (2)

(57) [Claims] 1. An optical disk according to a predetermined control command
It emits a light beam, receives the reflected light of the light beam, and
An optical disk that reproduces the user data recorded on the optical disk.
In the screen playback method, The recording area is divided into multiple sectors,Of the sector
Depending on the predetermined command given from the host computer
User data recording in the first sector specified by
Area directory data, file allocation
Table and loader are recorded, and other than the first sector above
OtherPredetermined in the user data recording area provided in the sector
The user data is recorded in the data unit of
Provided in the above sectorBen to externally inaccessible area
The above optical disc with dark unique data recordedAbout
The specified frame given by the host computer
The loader from the first sector specified by the
Playback and send it to the host computer, The loader given by the host computer is
Depending on the command issued, the head section of the optical disk
From the above sectors other than
Play the data, The vendor of a predetermined value preset from the other sector
-When playing back unique data,
Other sectors corresponding to the vendor unique data
Set it to a new start sector and set it to the host computer above.
The light in response to the predetermined control command given from
The above user data from the new first sector of the disk
To output to the above host computer, and
The above-mentioned vendor-unique data of the above-mentioned predetermined value from the sector
When it cannot be reproduced, the above user data is not reproduced.
To do An optical disc reproducing method characterized by the above. 2.The recording area is divided into multiple sectors, Of the user data recording area provided in each of the above sectors
Specified by a predetermined command of the host computer
The data is recorded in the user data recording area of the first sector. Rectory
Data, file allocation table, loader
While being recorded, the
The user data is recorded in the user data recording area in a predetermined data unit.
Data is recorded, Issued by the loader reproduced from the first sector
It is provided in the other sector mentioned above that is played according to the command.
Set in a specific other sector of the externally inaccessible area.
The above-mentioned first sector in the above-mentioned externally inaccessible area
In place of the above, a new head sector for reproducing the above user data
Vendor with a specified value that specifies the other sector set above
Unique data recorded Characterized byLight disc
Ku.